After attending Tokyo Announce Gakuin Performing Arts College and Mausu Promotion Actor Training Center, he joined
Mausu Promotion. He is currently a freelancer. Among his many roles, he voiced Shichika Yasuri in
Katanagatari, Kuranosuke Shiraishi in
The Prince of Tennis, Reiner Braun in
Attack on Titan, Kojou Akatsuki in
Strike the Blood, IV in
Yu-Gi-Oh! Zexal, Saburō Katō in
Star Blazers: Space Battleship Yamato 2199, Junpei Hyūga in ''
Kuroko's Basketball, Sentarō Kawabuchi in Kids on the Slope, Haruhiro in Grimgar of Fantasy and Ash, Daryun in The Heroic Legend of Arslan, Orga Itsuka in Mobile Suit Gundam: Iron-Blooded Orphans, Akari Hizamaru in Terra Formars, Doppo Kunikida in Bungo Stray Dogs, Asahi Azumane in Haikyu!!, Fumikage Tokoyami in My Hero Academia, Nagare Akiba in Ushio and Tora, John H. Watson in The Empire of Corpses, Aren Kuboyasu in The Disastrous Life of Saiki K., Genjirō Tanigaki in Golden Kamuy, Joe in Megalobox, Houjou Shūsaku in In This Corner of the World, Ausukai Jin in Boogiepop and Others, Kanata Hoshijima in Astra Lost in Space, Shin in Dorohedoro, Belial in Granblue Fantasy, Welt Yang in Honkai Impact 3rd and Honkai: Star Rail, and Watanabe in Punishing: Gray Raven''. Hosoya won awards at the
8th Seiyu Awards and
10th Seiyu Awards for best supporting actor. On April 23, 2017, he underwent treatment for his throat. He resumed his career on August 4, 2017. ==Personal life==